Q.

Consider the following statements.(A) All black coloured objects are considered black bodies.(B) Black colour is a good reflector of heat.Select the correct option.(a) (A) is false but (B) is true.(b) Both (A) and (B) are true.(c) (A) is true but (B) is false.(d) Both (A) and (B) are false.

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a

Both (A) and (B) are true.

b

(A) is true but (B) is false.

c

(A) is false but (B) is true.

d

Both (A) and (B) are false.

answer is D.

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Detailed Solution

A BLACK BODY is that absorbs and emits heat rays of all wavelengths , Fery's black body is treated as perfect black body.Aii black coloured objects are not perfect black bodies .BLACK COLOUR IS A GOOD ABSORBER  BUT NOT A REFLECTOR.
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Consider the following statements.(A) All black coloured objects are considered black bodies.(B) Black colour is a good reflector of heat.Select the correct option.(a) (A) is false but (B) is true.(b) Both (A) and (B) are true.(c) (A) is true but (B) is false.(d) Both (A) and (B) are false.